Street Scale Models

Urban areas cannot be considered as homogeneous entities; the largest pollution levels occur in street canyons, where the dilution of car exhaust gases is limited by the presence of buildings flanking the street. Moreover, we are dealing here with pollution phenomena that take place in the immediate vicinity of the source, the car traffic. Therefore modelling of this pollution must account for micro-scale processes, i.e. a scale that is much smaller than the meso-scale discussed in Chapter 10.

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